Port plug for hydraulic cylinders



FIG. 1 is a top plan view of a port plug for hydraulic cylinders showing our new design;

FIG. 2 is a side elevational view;

FIG. 3 is a bottom plan view; and,

FIG. 4 is a cross sectional view taken along lines 4--4 of FIG. 1. 

The ornamental design for a port plug for hydraulic cylinders, as shown. 